Index: lib/src/delegate/stream_sink.dart |
diff --git a/lib/src/delegate/stream_sink.dart b/lib/src/delegate/stream_sink.dart |
index e06afc1b0a611c919a0d7fa6d9b69a61cecd7be7..9b52b19e5d5e642dca21e3e1b2ab812cbd8056df 100644 |
--- a/lib/src/delegate/stream_sink.dart |
+++ b/lib/src/delegate/stream_sink.dart |
@@ -14,8 +14,18 @@ class DelegatingStreamSink<T> implements StreamSink<T> { |
Future get done => _sink.done; |
/// Create delegating sink forwarding calls to [sink]. |
- DelegatingStreamSink(StreamSink sink) |
- : _sink = sink; |
+ DelegatingStreamSink(StreamSink<T> sink) : _sink = sink; |
+ |
+ DelegatingStreamSink._(this._sink); |
+ |
+ /// Creates a wrapper that coerces the type of [sink]. |
+ /// |
+ /// Unlike [new StreamSink], this only requires its argument to be an instance |
+ /// of `StreamSink`, not `StreamSink<T>`. This means that calls to [add] may |
+ /// throw a [CastError] if the argument type doesn't match the reified type of |
+ /// [sink]. |
+ static StreamSink/*<T>*/ typed/*<T>*/(StreamSink sink) => |
+ sink is StreamSink/*<T>*/ ? sink : new DelegatingStreamSink._(sink); |
void add(T data) { |
_sink.add(data); |